nb

Noun
  1. A soft grey ductile metallic element used in alloys;
    Occurs in niobite;
    Formerly called columbium (synset 114671120)
    is a type of: metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
    subtypes: columbium - a former name for niobium
    substance meronym: columbite, niobite - a black mineral that is an ore of niobium and tantalum
    same as: atomic number 41, niobium
  2. A Latin phrase (or its abbreviation) used to indicate that special attention should be paid to something (synset 106777091)
    "the margins of his book were generously supplied with pencilled NBs"
    is a type of: annotation, notation, note - a comment or instruction (usually added)
    same as: n.b., nota bene

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